Letter from Kei 4 is a file in Fatal Frame III: The Tormented.
Transcript[]
Dear Yuu,
Have you listened to the 3 tapes I sent before? I'd like you to listen to them before you read the rest.
Maybe you won't believe it, but I've had "The Manor of Sleep" dream. First I thought I was just thinking about the manor too much, but after listening to those tapes and to Mio, I'm displaying the same symptoms.
In the dream, I'm in a snowy manor. I don't remember it well, but it resembles the house I got the "Camera Obscura" from. I get a bad sense from the manor. Just like the testimonies. The only difference is, I was pursuing "Mio" in the manor, and Mio "wasn't dead".
If the urban legend of "The Manor of Sleep" is true, and I can wake Mio from her dream, maybe I can save her.
Even if it makes little sense, I feel I'm getting closer to the truth.
Regards,
Kei Amakura